Phono shorting plugs should be inserted into any RIAA inputs that are not connected to, and thus correctly terminated by, record decks/turntables.

Caution –If removing shorting plugs to connect turntables, do not insert them into other RCA inputs or outputs, this results in very poor audio.

Order spare phono shorting plugs from your dealer or local A&H distributor, 
Part no. AL4396